You've heard that plastic is polluting the oceans—between 4.8 and 12.7 million tonnes enter ocean ecosystems every year.
你听说过塑料污染海洋——每年有480至1270万吨塑料进入海洋生态系统。
Ocean ecosystems are degrading.
海洋生态系统正在退化。
Ocean ecosystems are in a lot of trouble and it all bears the hallmarks of human interference.
现在海洋生态系统有许多问题，而所有这些问题都有人为干扰的特点。
Pershing says Roman's work is bound to get scientists thinking more about the role of large marine mammals in ocean ecosystems.
珀欣说，罗曼的研究会使科学家们更关注海洋生态系统中，大型海洋生物扮演的角色。
But their Numbers have dwindled since the dawn of the 20th century, with unknown consequences for ocean ecosystems and the planet's carbon cycle.
但自20世纪初以来，它们的数量已逐渐减少，随之而来的是由此对海洋生态系统和全球碳循环产生的未知后果。
Ocean ecosystems are beset by changes in nutrient levels due to run off near the coasts and by overfishing, which plays havoc with food webs nearly everywhere.
由于沿岸的营养流失和过度捕捞，海洋生态系统遭受由于海岸带侵蚀造成的水体营养水平改变，还有过度捕捞，也极大破坏了几乎全球各地的食物网。
Overfishing not only causes depletion in individual fish stocks, but also disruption to entire ecosystems and food webs in the ocean.
过度捕捞不仅引起个别鱼种的消耗，而且还引起海洋中整个生态系统和食物网的崩溃。
Known or probable damage includes ocean acidification, loss of rain forests, degradation of ecosystems, and desertification.
已知或可能的损害包括海洋酸化、热带雨林消失、生态系统退化还有沙漠化。
He says the changes to Marine ecosystems will affect how the ocean absorbs carbon dioxide.
他说，改变海洋生态系统会影响到海洋吸收二氧化碳。
This helps slow the rate of global warming but increases ocean acidity, posing a potentially disastrous threat to Marine ecosystems.
虽然这有利于减缓全球变暖的趋势，但却增加了海洋的酸性，有可能对海洋生态系统构成灾难性威胁。
Areas like this, where freshwater meets the ocean, create dazzlingly diverse ecosystems called estuaries.
在这样的地区里，淡水湖与海洋相遇，创建了一个名为河口的多种多样、光辉灿烂的生态系统。
This is the home of Oregon State's Hatfield Marine Science Center, devoted to research about Marine ecosystems and ocean energy.
这里就是俄勒冈州立大学Hatfield海洋科学中心的所在地，该中心专门从事海洋生态系统和海洋能源方面的研究。
Global change could alter the functioning of these ecosystems and the way carbon is cycled in the ocean.
气候的变化能够改变这些生态系统的功能以及海洋中碳循环的方式。
Changes to ecosystems due to wildfire, the ocean becoming more acidic, flooding and drought.
山林大火、海水酸化、洪水和干旱会引起生态系统的变化。
These prehistoric ecosystems have been around for 400million years and support one third of all Marine life, despite only inhabiting 0.2 per cent of the ocean floor.
这些史前生态系统已经存在约4亿年，支撑着约三分之一的所有海洋生物，尽管只占栖息在海底的0.2%。
All the freshwater ecosystems can be found within a watershed-a set of habitats that drain into a single body of water such as a big lake or the ocean.
所有这些淡水生态系统可以在一个分水岭中被发现—那是一套可以把比如大湖泊或者海洋这样单一的水域排干的栖息地。
This method, though, is expensive and does damage to the fragile ecosystems on the ocean floor.
这种方法不仅花费昂贵，而且也容易破坏海底脆弱的生态系统。
Reefs may also face damage from ocean acidification, an effect of higher CO2 levels rather than of warming, as may other ecosystems, though the size of the impacts is uncertain.
珊瑚礁也要面对海洋酸化带来的危害，海洋酸化是二氧化碳水平提高给海洋造成的不同于其他生态系统气候变暖的另一种影响，而这种影响的大小还无法不确定。
For more than a month, thick sediment has poured into the ocean depositing chemicals and pesticides onto fragile Marine ecosystems.
厚厚的包含化学制品和杀虫剂的沉淀物在一个多月后，流向大海，流向脆弱的海洋生态系统。
Wetland is extremely widely distributed on the Earth, is a unique ecosystem formed by interaction both land and water, is one of three major ecosystems including the forest and the ocean on the world.
湿地在地球上分布极为广泛，是水陆相互作用形成的独特生态系统，与森林、海洋并列为全球三大生态系统。
Wetland is extremely widely distributed on the Earth, is a unique ecosystem formed by interaction both land and water, is one of three major ecosystems including the forest and the ocean on the world.
湿地在地球上分布极为广泛，是水陆相互作用形成的独特生态系统，与森林、海洋并列为全球三大生态系统。
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